NEW YORK ACADEMY OF SCIENCES. 

 MEMOIRS, VOLUME II, PART II, 1900. 



ARTICLE III. 



VESICLE 



AND ITS 



RELATION TO GASTRTJLATION AND 

 CONCRESCENCE. 



FRANCIS BERTODY SUMNER. 



TEXT FIGURES 1-34. 



NEW YORK : 

 PUBLISHED BY THE ACADEMY. 



Submitted in partial fulfillment of the requirements for 



the Degree of Doctor of Philosophy in the Faculty of 



Pure Science, Columbia University 



